foreign worker job change visa reporting deadline Korea non-teaching jobs Korea jobs in Korea for foreigners Kowork foreign worker unsafe work Korea labor office foreign workers Korea work visa status Seoul Global Center JobKorea Korea job search guide LinkedIn Korea unpaid salary Korea foreigner part-time jobs Korea e7 visa job change korea work visa korea foreign worker mistakes Korea visa violation part time korea foreign worker job change korea XpatJobs foreign employment law korea visa sponsorship Korea labor rights foreigners Korea job termination Korea foreigner foreign worker reporting delay Korea foreign worker side job korea workplace change reporting Korea foreign worker teaching jobs Korea fired in Korea visa labor office communication Korea work visa korea rules korea employment visa unpaid wages foreigner Korea KOTRA job fair Saramin resigning job korea quitting job Korea foreigner work in South Korea 2025 English jobs Korea expat career Korea foreign worker resignation foreigner jobs Seoul visa reporting timing Korea change job korea visa foreign worker ghosted Korea Korea job platforms freelance jobs Korea company closed Korea visa employer no response Korea notice period korea employer shutdown foreign worker Korea